<template>
    <div class="sidebar">
        <!-- el-menus 是 下拉菜单标签 -->
        <!-- https://www.cnblogs.com/gaofz/p/11096831.html -->
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#20a0ff"
            unique-opened
            router
        >
            <template v-for="item in items">
                <!-- 存在二级列表 -->
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <div @click="xxx(item.title)">
                                <em :class="item.icon"></em>
                                <span slot="title">{{ item.title }}</span>
                                <!-- <el-menu-item :index="item.index" :key="item.index">
                                <i :class="item.icon"></i>
                                <span slot="title">{{ item.title }}</span>
                            </el-menu-item> -->
                            </div>
                        </template>
                        <template v-for="subItem in item.subs">
                            <!-- 存在三级列表 -->
                            <el-submenu v-if="subItem.subs" :index="subItem.index" :key="subItem.index">
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item v-for="(threeItem, i) in subItem.subs" :key="i" :index="threeItem.index">{{
                                    threeItem.title
                                }}</el-menu-item>
                            </el-submenu>
                            <!--  -->
                            <el-menu-item v-else :index="subItem.index" :key="subItem.index">
                                <i :class="subItem.icon"></i>
                                {{ subItem.title }}
                            </el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus';
export default {
    data() {
        return {
            collapse: false,
            items: [
                {
                    icon: 'el-icon-lx-home',
                    index: 'dashboard',
                    title: '首页'
                },
                {
                    icon: 'el-icon-lx-emoji',
                    index: 'stumain',
                    title: '学员信息',
                    subs: [
                        {
                            icon: 'el-icon-lx-profile',
                            index: 'stubasic',
                            title: '基本查询'
                        },
                        {
                            icon: 'el-icon-lx-friend',
                            index: 'stuclass',
                            title: '班级查询'
                        },
                        {
                            icon: 'el-icon-lx-group',
                            index: 'stusource',
                            title: '来源查询'
                        }
                    ]
                },
                {
                    icon: 'el-icon-lx-cascades',
                    index: 'stumanager',
                    title: '学生管理'
                },
                {
                    icon: 'el-icon-lx-calendar',
                    index: 'lifeinfo',
                    title: '生活信息管理'
                },
                {
                    icon: 'el-icon-lx-copy',
                    index: '',
                    title: '班级管理',
                    subs: [
                        {
                            icon: 'el-icon-lx-friendadd',
                            index: 'addclass',
                            title: '添加到班级'
                        },
                        {
                            icon: 'el-icon-lx-searchlist',
                            index: 'findclass',
                            title: '查看班级信息'
                        },
                        {
                            icon: 'el-icon-lx-refresh',
                            index: 'updateclass',
                            title: '修改班级信息'
                        }
                    ]
                },
                {
                    icon: 'el-icon-pie-chart',
                    index: 'oldstu',
                    title: '往届学员'
                },
                {
                    icon: 'el-icon-lx-warn',
                    index: 'nb',
                    title: '管理员的管理员'
                },
                {
                    icon: 'el-icon-lx-recharge',
                    index: 'pay',
                    title: '缴费管理'
                }
            ]
        };
    },
    computed: {
        onRoutes() {
            return this.$route.path.replace('/', '');
        }
    },
    methods: {
        xxx(title) {
            if (title == '学员信息') {
                this.$router.push('/stumain');
            }
        }
    },
    created() {
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', (msg) => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    },
    mounted: function () {
        // this.$nextTick(function () {
        //     console.log("界面加载挖亲笔。。。。。")
        //     setTimeout(function () {
        //         var all_li = window.document.querySelectorAll(".el-submenu__title>.el-menu-item")
        //         for (var i = 0; i < all_li.length; i++) {
        //             all_li[i].style.paddingLeft = "0px"
        //         }
        //     } , 800)
        // })
    }
};
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}
.sidebar > ul {
    height: 100%;
}
</style>
